Adjustable Current Source – 0 to 1A

  • Rajkumar Sharma
  • 97 Views
  • moderate
  • Tested
  • SKU: EL143488
  • Quote Now

 

This voltage-to-current (V-I) converter delivers a well-regulated current to a load. The circuit accepts an adjustable input voltage from Trimmer potentiometer PR1 and converts it to an output current from 0A to 1A. The current is regulated by feeding the voltage across a low-side, current-sense resistor R9 back to the OPAMP. The output Darlington pair allows for higher current gain. Feedback components R8 and C6 provide frequency compensation to ensure the stability of the circuit during transients. They also help reduce noise. R8 provides a DC feedback path directly at the current setting resistor, R9, and C1 provide a high-frequency feedback path that bypasses the NPN pair.

Note: The project can support higher current and voltage ranges by changing the sense resistor, BJT transistor, and Input voltage. It is important to use an appropriate heatsink for Q1 to take care of overheating.

Features

  • Supply 24V
  • Output Current 0 to 1A (Adjustable)
  • PCB Dimensions 41.59 x 30.48 mm
  • 4 x 2.5 mm Mounting Holes

Connections

  • CN1: Pin 1 = GND, Pin + Load Supply 24V DC
  • CN2: Pin 1 = + Load Supply, Pin 2 GND
  • D1: Power LED
  • PR1: Current Adjust 0 to 1A

Schematic

Parts List

NOQNTYREFDESCMANUFACTURERSUPPLIERSUPPLIER PART NO
11CN12 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
24U2,CN2,C5,R10DNP
32C1,C3100nF/50V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
41C2220uF/50V ELECTROLYTIC SMDPANASONICDIGIKEYPCE3921CT-ND
51C410uF/35V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
61C610PF/50V CERAMIC SMD SIZE 0805MURATA/YAGEODIGIKEY
71D1LED RED SMD SIZE 0805OSRAMDIGIKEY475-1278-1-ND
81PR1100K MULTITURN TRIMMER POTBOURNSDIGIKEY3296Y-104LF-ND
91Q1TIP142 TO247ON SEMIDIGIKEYTIP142GOS-ND
103R1,R6,R70E SMD SIZE 0805MURATA/YAGEODIGIKEY
111R2330K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
121R33.3K 5% SMD SIZD SIZE 0805MURATA/YAGEODIGIKEY
131R449.9K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
141R5249E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
151R810K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
161R90.01E 1% SMD SIZDE 2512MURATA/YAGEODIGIKEY
171U1OPA197 SOT23TIDIGIKEY296-47813-1-ND
181Z12 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND

Connections

Gerber View

Photos

Video

OPA197 Datasheet

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